<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>tracking.js - color hello world</title>
  <link rel="stylesheet" href="assets/demo.css">

  <script src="../build/tracking-min.js"></script>

  <style>
  .rect {
    width: 80px;
    height: 80px;
    position: absolute;
    left: -1000px;
    top: -1000px;
  }
  </style>
</head>
<body>
  <div class="demo-title">
    <p><a href="http://trackingjs.com" target="_parent">tracking.js</a> － detect certain colors in a image</p>
  </div>

  <div class="demo-frame">
    <div class="demo-container">
      <img id="img" src="assets/psmove.png" />
    </div>
  </div>

  <script>
    window.onload = function() {
      var img = document.getElementById('img');
      var demoContainer = document.querySelector('.demo-container');

      var tracker = new tracking.ColorTracker(['magenta', 'cyan', 'yellow']);

      tracker.on('track', function(event) {
        event.data.forEach(function(rect) {
          window.plot(rect.x, rect.y, rect.width, rect.height, rect.color);
        });
      });

      tracking.track('#img', tracker);

      window.plot = function(x, y, w, h, color) {
        var rect = document.createElement('div');
        document.querySelector('.demo-container').appendChild(rect);
        rect.classList.add('rect');
        rect.style.border = '2px solid ' + color;
        rect.style.width = w + 'px';
        rect.style.height = h + 'px';
        rect.style.left = (img.offsetLeft + x) + 'px';
        rect.style.top = (img.offsetTop + y) + 'px';
      };
    };
  </script>

</body>
</html>
